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The middle pedal, best identified as the "sostenuto pedal," is reliably present on most grand pianos. The sostenuto pedal controls a lever that grabs and holds in a raised position only those dampers that are raised from the strings at the time the sostenuto pedal is depressed. From this view, it is possible to see the slight extra-lifting of the already raised dampers when the sostenuto pedal is engaged. After the sostenuto is engaged the damper pedal may be used independently. When the damper pedal is released the dampers held by the sostenuto remain raised.
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